Thoughts on specify freetype lib's version when use `-sUSE_FREETYPE`

With the port work of my legacy C++ 2d ui render engine, i noticed a subtle difference between native version and wasm version:

When set fontSize=30 and get font metrics(depends on freetype), the native version returns 31, but wasm version got 30.

The only difference lies in the different version of freetype. I wish there could be a mechanism to specify freetype lib's version when use `-sUSE_FREETYPE`...